CSS UL Constrain Within Div

I have a horizontal nav that wouldn't wrap within the width dimensions of a div until I assigned the LI items float:left.

Two problems now, one is that I'd prefer the items centered, not aligned left, and more importantly, in Safari 2.04 on Mac 10.42 the nav contents are not placed where they should be, they're hugging the left edge of the div.

Is there a way to restrain the UL LI items within the wrapper div without floating left so I can retain there centering and keep the left padding?